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Fallax
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Kingenoidea
Family:
Aulacothyropsidae
Formal Genus Name and Reference:
Fallax ATKINS, 1960a, p. 72
Type Species:
F. dalliniformis, OD
Images
(Click to enlarge in a new window)
Fig. 1460, 4a-e. *F. dalliniformis, ac, dorsal, lateral, and anterior views of holotype, NHM ZB2988, X1 (Atkins, 1960a), d, dorsal interior showing diploform loop, e, oblique view of ventral valve interior showing dental plates and muscle scars, X2 (new).
Synonyms
Geographic Distribution
eastern Atlantic, western and southwestern Pacific
Age Range
Beginning Stage in Treatise Usage:
Holocene
Beginning International Stage:
Greenlandian
Fraction Up In Beginning Stage:
0
Beginning Date:
0.01
Ending Stage in Treatise Usage:
Holocene
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
"Medium, biconvex, smooth, elongate ovate to subpentagonal, anterior commissure rectimarginate to parasulcate, beak low, erect, beak ridges rounded, deltidial plates conjunct in adults, foramen small, round, permesothyrid. Dental plates lamellar, straight, pedicle collar broad, sessile, impunctate. Cardinalia lamellar with short, well-developed septalium, inner and outer hinge plates well developed, crural bases not differentiated, cardinal process not differentiated, median septum extending anteriorly about three-quarters valve length, crura short, subparallel, crural processes short, loop diploform, lophophore and mantle finely spiculate."
References
Museum or Author Information
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Kingenoidea
Family:
Aulacothyropsidae
Formal Genus Name and Reference:
Fallax ATKINS, 1960a, p. 72
Type Species:
F. dalliniformis, OD
Images
(Click to enlarge in a new window)
Fig. 1460, 4a-e. *F. dalliniformis, ac, dorsal, lateral, and anterior views of holotype, NHM ZB2988, X1 (Atkins, 1960a), d, dorsal interior showing diploform loop, e, oblique view of ventral valve interior showing dental plates and muscle scars, X2 (new).
Synonyms
Geographic Distribution
eastern Atlantic, western and southwestern Pacific
Age Range
Beginning Stage in Treatise Usage:
Holocene
Beginning International Stage:
Greenlandian
Fraction Up In Beginning Stage:
0
Beginning Date:
0.01
Ending Stage in Treatise Usage:
Holocene
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
"Medium, biconvex, smooth, elongate ovate to subpentagonal, anterior commissure rectimarginate to parasulcate, beak low, erect, beak ridges rounded, deltidial plates conjunct in adults, foramen small, round, permesothyrid. Dental plates lamellar, straight, pedicle collar broad, sessile, impunctate. Cardinalia lamellar with short, well-developed septalium, inner and outer hinge plates well developed, crural bases not differentiated, cardinal process not differentiated, median septum extending anteriorly about three-quarters valve length, crura short, subparallel, crural processes short, loop diploform, lophophore and mantle finely spiculate."